Device and method of detecting turn-to-turn short circuit of electromagnetic voltage transformer

Abstract

The invention discloses a device and a method of detecting turn-to-turn short circuit of an electromagnetic voltage transformer. The detection device comprises a high-frequency low-voltage steep pulse generation module, a high-speed acquisition module and an upper computer with built-in analysis software, wherein the high-frequency low-voltage steep pulse generation module is used for generating nanosecond steep pulses and injecting the steep pulse signals to a detected electromagnetic voltage transformer winding; the high-speed acquisition module is used for acquiring characteristic waveforms after passing through the detected electromagnetic voltage transformer winding and containing winding short circuit fault, and after pre-processing and storage are carried out, the characteristic waveforms are transmitted to the upper computer; and the upper computer adopts a repetitive pulse method to analyze and process the received characteristic waveforms, and thus, the short circuit fault characteristics of the detected electromagnetic voltage transformer winding can be obtained. Thus, the early turn-to-turn fault of the voltage transformer winding can be detected, turn-to-turn insulation conditions can be positioned and compared quantitatively, further expansion of the fault can be avoided, and reliable guarantee is provided for safe and stable operation of a power system.

Description

technical field [0001] The invention relates to the technical field of voltage transformers, in particular to a detection method for a short circuit between turns of a voltage transformer. Background technique [0002] Electromagnetic voltage transformer is a voltage switching device commonly used in power systems. It isolates high and low voltages and provides standardized outputs for protection and metering equipment. The inter-turn insulation performance of the transformer is of great significance to the safe operation and metering and settlement of the power system. However, the inter-turn short circuit is one of the main faults of the transformer. The inter-turn short circuit will cause the longitudinal insulation strength of the transformer to decrease and the measurement error In severe cases, it will cause a power outage of the transmission line or even cause a trip. If the inter-turn short circuit can be effectively detected at the initial stage, the expansion of t...

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Problems solved by technology

[0008] The above methods have been applied for many years and have accumulated a lot of experience, but there are shortcomings and deficiencies in these methods

In fact, when system accidents caused by transformer faults occur frequently, traditional fault analysis and diagnosis techniques are often incompetent, so a method that can accurately detect early turn-to-turn faults in transformer windings is urgently needed

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